Calculator
Retaining Wall Calculator
Block count, base gravel, and cap stones for a segmental wall.
Inputs
You need
120 blocks · 20 caps
- Blocks per course
- 20
- Courses
- 6
- Total blocks
- 120
- Caps
- 20
- Base gravel (6" x 12" trench)
- 0.37 yd³
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Enter your wall length, height, and block size. Returns block count, gravel base, and cap count.
Materials you'll need
Frequently asked
How tall can a DIY retaining wall be?
Most codes allow up to 4 ft without engineering. Taller walls need engineered plans and often geogrid reinforcement.